The following four graphs represent four market scenarios, each of which would cause either a movement along the supply curve for premium bottled water or a shift of the supply curve. Match each scenario with the appropriate graph.
a. A decrease in the supply of sports drinks
b. A drop in the average household income in the United States from $56,000 to $52,000
c. An improvement in the bottling technology for premium bottled water
d. An increase in the prices of electrolytes used in premium bottled water
